Definition of hemlock

• n. - The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata, bulbifera, and virosa, and the Conium maculatum. See Conium.
• n. - An evergreen tree common in North America (Abies, / Tsuga, Canadensis); hemlock spruce.
• n. - The wood or timber of the hemlock tree.